Pretend this is a really awesome title (MuiTan)

Muichiro has never really had a real friend. That was, of course, until he met Tanjiro, who was a sunshine he never knew he needed. Tanjiro had plenty, but once Muichiro catches his eye, he just really wants to be friends with him specifically. could this ever become something more? And will there be an interference? (Personally, I don't have much of an idea because I'm winging it, but yes.) (btw it's modern au)